The Subterfuge focused arcane school complements the Stealth Mage multiclass archetype.
Associated School: Illusion.
Replacement Powers: The following school powers replace the extended illusions and blinding ray powers of the illusion school.
Ranged Legerdemain (Su): You can use Disable Device and Sleight of Hand at close range (25 ft. + 5 ft./2 levels). Working at a distance increases the normal skill check DC by 5, and you can't take 10 on this check. Any object to be manipulated must weigh 1 pound per wizard level or less. You can only use this ability if you have at least 1 rank in the skill being used. At 10th level, you can take 10 on the check. At 20th level, whenever you use ranged legerdemain, assume the roll resulted in a natural 20.
Surprise Spells: At 1st level, you can add your sneak attack damage to any spell that deals damage from up to 30 feet away, if the targets are flat-footed. This additional damage only applies to spells that deal hit point damage, and the additional damage is of the same type of the spell. If the spell allows a saving throw to negate or halve the damage, it also negates or halves the sneak attack damage. Alternatively, you can add +1 to the DC of any spell if the targets are flat-footed. This bonus to DCs increases to +2 at 9th level and +3 at 17th level. You can use this ability a number of times per day equal to 3 + your Intelligence modifier.